Portion of a key blade blank



FIG. 1 is a front elevational view of a portion of a key blank showing our new design;

FIG. 2 is a reduced left side elevational view thereof;

FIG. 3 is a reduced right side elevational view thereof;

FIG. 4 is a reduced top plan view thereof; and,

FIG. 5 is a reduced bottom plan view thereof. 

The ornamental design for a portion of a key blade blank, as shown and described. 